爲什麼MySQL的內部聯接後作爲

Question

select appsflyer_device_id as idd,media_source from PlayerAppData inner join 
(select APID from PlayerRecharge) as t1 
on t1.APID = idd; 

errr找不到列：在「關於條款」未知列「長途」

Answer 1

你不能在SELECT子句和ON子句中使用相同的別名。你應該試試

SELECT appsflyer_device_id AS idd, 
     media_source 
FROM playerappdata p 
     INNER JOIN (SELECT apid 
        FROM playerrecharge) AS t1 
       ON t1.apid = p.appsflyer_device_id;